D) social construction theory on gender is the theory that is widely used in the study of sexuality and includes queer theory. This theory emphasizes the role of social and cultural factors in shaping our understanding of gender and sexuality, and it recognizes that these categories are not fixed or essential, but rather are constructed and performed in different ways in different contexts. Queer theory, in particular, challenges traditional ideas about gender and sexuality, and seeks to disrupt and subvert dominant norms and categories.